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cb40b5b920
commit f73b3cc39c upstream.
If the build user has the CFLAGS variable set in their environment,
objtool blindly appends to it, which can cause unexpected behavior.
Clobber CFLAGS to ensure consistent objtool compilation behavior.
Reported-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/83a276df209962e6058fcb6c615eef9d401c21bc.1567121311.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
CC: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
65 lines
1.7 KiB
Makefile
65 lines
1.7 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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include ../scripts/Makefile.include
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include ../scripts/Makefile.arch
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ifeq ($(ARCH),x86_64)
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ARCH := x86
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endif
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# always use the host compiler
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HOSTAR ?= ar
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HOSTCC ?= gcc
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HOSTLD ?= ld
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AR = $(HOSTAR)
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CC = $(HOSTCC)
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LD = $(HOSTLD)
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ifeq ($(srctree),)
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srctree := $(patsubst %/,%,$(dir $(CURDIR)))
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srctree := $(patsubst %/,%,$(dir $(srctree)))
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endif
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SUBCMD_SRCDIR = $(srctree)/tools/lib/subcmd/
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LIBSUBCMD_OUTPUT = $(if $(OUTPUT),$(OUTPUT),$(CURDIR)/)
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LIBSUBCMD = $(LIBSUBCMD_OUTPUT)libsubcmd.a
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OBJTOOL := $(OUTPUT)objtool
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OBJTOOL_IN := $(OBJTOOL)-in.o
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all: $(OBJTOOL)
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INCLUDES := -I$(srctree)/tools/include \
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-I$(srctree)/tools/arch/$(HOSTARCH)/include/uapi \
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-I$(srctree)/tools/objtool/arch/$(ARCH)/include
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WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed
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CFLAGS := -Wall -Werror $(WARNINGS) -fomit-frame-pointer -O2 -g $(INCLUDES)
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LDFLAGS += -lelf $(LIBSUBCMD)
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# Allow old libelf to be used:
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elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(CC) $(CFLAGS) -x c -E - | grep elf_getshdr)
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CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED)
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AWK = awk
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export srctree OUTPUT CFLAGS SRCARCH AWK
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include $(srctree)/tools/build/Makefile.include
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$(OBJTOOL_IN): fixdep FORCE
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@$(MAKE) $(build)=objtool
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$(OBJTOOL): $(LIBSUBCMD) $(OBJTOOL_IN)
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@$(CONFIG_SHELL) ./sync-check.sh
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$(QUIET_LINK)$(CC) $(OBJTOOL_IN) $(LDFLAGS) -o $@
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$(LIBSUBCMD): fixdep FORCE
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$(Q)$(MAKE) -C $(SUBCMD_SRCDIR) OUTPUT=$(LIBSUBCMD_OUTPUT)
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clean:
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$(call QUIET_CLEAN, objtool) $(RM) $(OBJTOOL)
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$(Q)find $(OUTPUT) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
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$(Q)$(RM) $(OUTPUT)arch/x86/lib/inat-tables.c $(OUTPUT)fixdep
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FORCE:
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.PHONY: clean FORCE
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